Click on image to enlarge.

Figure 7. Another series of basement faults mapped by magnetics. These lie on the western edge of the Powder River Basin where an underlying thrust fault results in the string of asymmetric anticlines shown here. This example also shows the cross faults that segment the thrust into individual advancing sheets which become anticlines. The fact that movement along basement cross faults cuts a thrust into segments is an important, and new, finding in structural geology.